.head{
    width: 100%;
    height: 150px;
    background-color: #ffffff;
    overflow: hidden;
}
.head_down{
    width: 100px;
    height: 999px;
    padding: 90px 0 0 0 ;
}
.jump{
    overflow: hidden;
    list-style-type: none;
}
.head_down_jump{
    float: left;
}